const path = require("path");
const CompressionWebpackPlugin = require("compression-webpack-plugin");
const port = process.env.port || process.env.npm_config_port || 8888;
const name = "Blog"; // page title
const IS_PRODUCTION = process.env.NODE_ENV === "production";
const webpack = require('webpack');
const cdn = {
  css: [],
  js: [
    "https://cdn.bootcss.com/vue/2.6.10/vue.min.js",
    "https://cdn.bootcss.com/vue-router/3.0.3/vue-router.min.js",
    "https://cdn.bootcss.com/vuex/3.1.0/vuex.min.js",
    "https://cdn.bootcss.com/axios/0.19.0-beta.1/axios.min.js",
  ],
};
// const host = window.location.host;
const externals = {
  vue: "Vue",
  "vue-router": "VueRouter",
  vuex: "Vuex",
  axios: "axios",
};

function resolve(dir) {
  return path.join(__dirname, dir);
}

module.exports = {
  publicPath: IS_PRODUCTION ? "./" : "./",
  outputDir: "dist",
  assetsDir: "static",
  lintOnSave: process.env.NODE_ENV === "development",
  productionSourceMap: false,
  devServer: {
    port,
    open: true,
    overlay: {
      warnings: false,
      errors: true,
    },
    proxy: {
      // change xxx-api/login => mock/login
      // detail: https://cli.vuejs.org/config/#devserver-proxy
      [process.env.VUE_APP_BASE_API]: {
        target: "http://192.168.1.196/", // `http://127.0.0.1:${port}/mock`,  http://192.168.1.196/`${host}/api/`
        changeOrigin: true,
        pathRewrite: {
          ["^" + process.env.VUE_APP_BASE_API]: "",
        },
      },
    },
    after: require("./mock/mock-server.js"),
  },
  configureWebpack: {
    name,
    resolve: {
      alias: {
        "@": resolve("src"), // 主目录
        views: resolve("src/views"), // 页面
        components: resolve("src/components"), // 组件
        api: resolve("src/api"), // 接口
        utils: resolve("src/utils"), // 通用功能
        assets: resolve("src/assets"), // 静态资源
        style: resolve("src/style"), // 通用样式
      },
    },
  },
  chainWebpack(config) {
    config.plugins.delete("preload"); // TODO: need test
    config.plugins.delete("prefetch"); // TODO: need test

    // set svg-sprite-loader
    config.module
      .rule("svg")
      .exclude.add(resolve("src/icons"))
      .end();
    config.module
      .rule("icons")
      .test(/\.svg$/)
      .include.add(resolve("src/icons"))
      .end()
      .use("svg-sprite-loader")
      .loader("svg-sprite-loader")
      .options({
        symbolId: "icon-[name]",
      })
      .end();

    // set preserveWhitespace
    config.module
      .rule("vue")
      .use("vue-loader")
      .loader("vue-loader")
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true;
        return options;
      })
      .end();
    config
      .plugin('ignore')
      // 忽略/moment/locale下的所有文件
      .use(new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/));

    config
      // https://webpack.js.org/configuration/devtool/#development
      .when(process.env.NODE_ENV === "development", config =>
        config.devtool("cheap-source-map")
      );

    config.when(process.env.NODE_ENV !== "development", config => {
      config
        .plugin("ScriptExtHtmlWebpackPlugin")
        .after("html")
        .use("script-ext-html-webpack-plugin", [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/,
          }
        ])
        .end();
      config.optimization.splitChunks({
        chunks: "all",
        cacheGroups: {
          libs: {
            name: "chunk-libs",
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: "initial", // only package third parties that are initially dependent
          },
          commons: {
            name: "chunk-commons",
            test: resolve("src/components"), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true,
          },
        },
      });
      config.optimization.runtimeChunk("single");
    });
    if (IS_PRODUCTION) {
      // config.plugin('analyzer').use(BundleAnalyzerPlugin)
      config.plugin("html").tap(args => {
        args[0].cdn = cdn;
        return args;
      });
      config.externals(externals);
      config.plugin("html").tap(args => {
        args[0].minify.minifyCSS = true; // 压缩html中的css
        return args;
      });
      // gzip需要nginx进行配合
      config
        .plugin("compression")
        .use(CompressionWebpackPlugin)
        .tap(() => [
          {
            test: /\.js$|\.html$|\.css/, // 匹配文件名
            threshold: 10240, // 超过10k进行压缩
            deleteOriginalAssets: false, // 是否删除源文件
          }
        ]);
    }
  },
  css: {
    // 是否使用css分离插件 ExtractTextPlugin
    extract: !!IS_PRODUCTION,
    // 开启 CSS source maps?
    sourceMap: false,
    // css预设器配置项
    // 启用 CSS modules for all css / pre-processor files.
    modules: false,
    loaderOptions: {
      sass: {
        data:
          '@import "style/_mixin.scss";@import "style/_variables.scss";@import "style/common.scss";', // 全局引入
      },
      less: {
        lessOptions: {
          javascriptEnabled: true,
        },
      },
    },
  },
};
